Process of making dialkylmalonyl ureas.



water.

srn'rns PATENT @h hliwhh GUSTAV KElL, OF HQCHST-ON-THE-MAIN, GERMANY,ASSIGhiQR T0 FARBWERKE, VORM. MEISTER, LUCEUS t'BRUNlNG, OF HUGHST-ONTHE-MAIN, GERMANY, 'A CORPORATION 0F GERMANY.

PRQGESS 0F MAKENQE: DiALK'ELiifll-ALQNYL UREA$i Specification of LettersPatent.

Patented June 5, 19 06.

Application filed December 22, 1905. Serial No. 292,916.

1'0 all whom it may concern:

Be it known that I, GUSTAV KEIL, P1111), chemist, a citizen of theEmpire of Germany, residing at Hochsbon-the-Mein, Germany, hsveinventedcertain useful Improvements in the itia'nuiscture of DialkylmalonylUrea-s, of which the following is a specification.

i have found that dislkylmelonylthio uress may he transformed intodialkylmelonyl me as by heating the former for a considerable time "witha solution of salts of heavy metals, such as load and copper sslts.

The process may be carried out, for in stance, es follows-2 One part, byWeight, of diethylmslonylthio urea is boiled forforty eight hours with asolution of four parts, byweight, of iced acetate m forty parts, byWeight, of

Lead solid is soon formed, yet boil.- is necessary for a considerabletime to complete the transformation The excess of lead may be removedfrom the solution by means of hydrogen sulfid or sulfuric acid and thediethylmelonyl urea of known properties is then obtained bycrystallization. In an analogous manner otherdialkylmslonyl urees aretransformed also while using other salts of heavy metals.

Having now described my invention, what I claim is The process hereindescribed for the menufecture of dislkylmalonyl ureas, which consists inheating dialkylmalonylthio ureas With solutions of salts of heavymetals.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing Witnesses.

' GUSTAV KEliJ. Witnesses JEAN GRUND, CARL GRUND.

